JP6593767B2 - High-strength warp knitted mesh sheet - Google Patents

Description

  The present invention relates to an improvement of a mesh sheet used in a construction site, and more particularly, to a high-strength warp knitted mesh sheet that is excellent in strength and has good shape stability and hardly causes misalignment.

  As is well known, in civil engineering and construction work sites, sheets are used for various purposes such as curing and laying, and some have a mesh structure to provide drainage and ventilation functions. Since it is necessary to endure the operation | work which requires a big load and tensile force, considerable intensity | strength is required.

  By the way, as a recent revetment protection method for preventing erosion, there is a method in which a concrete block is placed in parallel on a sheet of fabric or the like and bonded, and then laid down on the soil surface to be protected while hanging together with this sheet by a crane. Has been developed.

  Conventionally, various proposals have been made regarding sheets (mats) used in the construction method. For example, a mesh having a thickness of 1 mm or less and a strength and a gap defined for the purpose of suppressing mechanical strength and sediment discharge. A woven fabric is disclosed (see Patent Document 1). This sheet has a woven fabric structure in which warps and wefts are interlaced, and is constituted by arranging warps or wefts roughly and providing gaps of a predetermined size.

  However, in such a mesh structure, since the binding force between the weaving yarns is weak, the meshes are easily misaligned, and if the sheet is not handled carefully in operations where a large load or tensile force is applied to the sheet, the size of the gap is small. There is a problem that the function of preventing sediment discharge becomes unstable.

  In addition, a mesh sheet for civil engineering / architecture using warp knitting technology aimed at arranging warp fiber concentrating rows between chain knitting rows and supporting them with weft insertion yarns, and arranging warp converging rows in a straight line has been proposed. (See Patent Document 2), and the warp fiber bundles are not interlaced with other yarns, so they can be arranged straight to exhibit high strength characteristics.

  However, since the reinforcing fibers of the warp bundles are merely sandwiched between the two weft insertion yarns between the chain braiding rows, there is a problem that the mesh holes of a fixed size cannot be maintained easily. is there.

JP 2007-169836 A Japanese Patent Laid-Open No. 06-101143

  The present invention has been made in view of the above-described problems in conventional mesh sheets, and the object is to have excellent strength and good shape stability. An object of the present invention is to provide a high-strength warp knitted mesh sheet that is less likely to be displaced.

  Means employed by the present inventor for solving the above technical problem will be described with reference to the accompanying drawings.

That is, according to the present invention, while the stitch row 2 formed by two adjacent knitting yarns 2a and 2b forms a collective stitch row 6 that is close to each other by the knitting structure,
The warp knitting structure of the knitting yarns 2a and 2b constituting the aggregate stitch row 6 is changed into a double denby changed structure guided by 1 in 1 out,
The knitting yarn 2a constituting one set stitch row 6 is knitted with the adjacent knitting yarn 2b on the opposite side every predetermined number of courses to form another set stitch row 6, and a boundary line between both set stitch rows Forming
In this set stitch row 6, the reinforcing fiber yarns 3 made of reinforcing fibers are inserted through the set stitch rows 6 by one stitch , and the weft insertion yarn 4 connecting the set stitch rows 6 and 6 is predetermined. Insert the weft at intervals to form the knitted fabric sheet body 1,
While forming a through hole 5 in a region surrounded by the set stitch rows 6 and 6 and the weft insertion yarns 4 and 4 adjacent at a predetermined interval,
The reinforcing fiber yarn 3 is distributed to the yarn bundles 3a and 3b, respectively, and either one of the knitting yarns 2a and 2b constituting the stitch row 2 is interposed in tension between the yarn bundles 3a and 3b. A high-strength warp knitted mesh sheet was completed by employing the technical means of tightening the bundles 3a and 3b of the reinforcing fiber yarn 3 and the weft insertion yarn 4 with these knitting yarns 2a and 2b.

  In addition, in order to solve the above-mentioned problems, the present invention adds a reinforcing fiber yarn 3 through a single stitch and, in addition to the above means, if necessary, and inserts at least a four-needle weft insertion yarn 4 in a predetermined manner. It is also possible to adopt a technical means in which the knitted fabric sheet body 1 is constructed by inserting the wefts at intervals.

Furthermore, in order to solve the above-mentioned problems, the present invention provides a double denby in which warp knitting structures of the knitting yarns 2a and 2b constituting the aggregate stitch row 6 are introduced by 1 in 1 out in addition to the above means as necessary. Change the organization of
The knitting yarn 2a constituting one set stitch row 6 is knitted with the adjacent knitting yarn 2b on the opposite side every predetermined number of courses to form another set stitch row 6, and a boundary line between both set stitch rows In addition, it is possible to adopt a technical means for forming a grid-like trace line by a tracer yarn inserted every predetermined number of wales.

  Furthermore, in order to solve the above-described problems, the present invention further includes technical means for additionally inserting a weft insertion thread 4 that is folded back only at both ends over the entire width of the knitting width of the sheet body 1 in addition to the above-described means as necessary. Can also be adopted.

  Furthermore, in order to solve the above-mentioned problems, the present invention provides a reinforcing fiber yarn 3 and a weft insertion yarn 4 in addition to the above-mentioned means as necessary, in which polyester fiber, polyamide fiber, polyolefin fiber, vinylon fiber, aramid fiber, It is also possible to adopt a technical means of producing with one or plural kinds of reinforcing fibers selected from carbon fiber and glass fiber.

  Furthermore, in order to solve the above-described problems, the present invention provides a product of the fineness D (dtex) of the reinforcing fiber yarns of the reinforcing fiber yarn 3 and the arrangement density W (lines / inch) in addition to the above means as necessary. It is also possible to adopt a technical means for setting the value in the range of 10,000 to 150,000.

Furthermore, in order to solve the above-mentioned problems, the present invention makes the shape of the through hole 5 substantially rectangular in addition to the above means as necessary, and the unit area of this through hole 5 is 0.1 to 3000 mm. The technical means of ² can also be adopted.

  In the present invention, while the stitch row formed by two adjacent knitting yarns forms a gathered stitch row that is close to each other by the knitting structure, the reinforcing stitches made of reinforcing fibers are inserted through the gathered stitch row, In addition, a weft insertion yarn is inserted at a predetermined interval to form a knitted fabric sheet body, and a through hole is formed in a region surrounded by the set stitch row and the weft insertion yarn adjacent at a predetermined interval. The reinforcing fiber yarns are distributed to the yarn bundles, and any one of the knitting yarns constituting the stitch row is interposed between the yarn bundles in a tension state, so that the yarn bundles of the reinforcing fiber yarns by these knitting yarns. And the weft insertion thread can be tightened.

  As described above, the mesh sheet of the present invention skillfully utilizes the elastic restoring force due to the rigidity of the reinforcing fiber yarn, and the two stitch rows are attracted to each other so that the warped insertion yarn and the reinforcing fiber yarn inserted by warp are inserted. Is integrated in the state of being wrapped in two stitch rows, so that the warped insertion yarns and warp insertion yarns are not easily displaced or pulled out, and are very easy to handle. Even if this warp knitting machine is used, it is possible to form a high-strength warp knitted mesh sheet that is excellent in strength, has good shape stability, and is less likely to cause misalignment.

  Therefore, for example, when used as a concrete block mat, even when suspended by a crane, the sheet to which the concrete block is bonded can be efficiently constructed without being deformed or damaged.

  In addition, when used as a base material for repair and reinforcement of concrete piers and floor slabs, the through holes in the area surrounded by the aggregate stitch row and weft insertion thread serve as high-viscosity resin passages, and the concrete surface A resin pool and an unimpregnated part are not formed between the base material and the resin impregnation operation is efficiently performed.

  Furthermore, since the position of the aggregate stitch row is regulated by the weft insertion yarn, the mesh hole is not deformed by an external force, and it is possible to exert a sure sediment prevention effect.

  In addition, when necessary, when a concrete block is affixed by using a trace line in the width direction due to a change in the knitting structure and a grid-like trace line by a warp insertion tracer yarn on the sheet surface as necessary. Since it can be used as a positioning line or a sheet cutting line, and a concrete block sticking operation can be performed accurately and efficiently, its practical utility value is very high.

It is a schematic diagram showing the structure of the mesh sheet | seat of 1st Embodiment of this invention. It is a whole front view showing the mesh sheet of a 1st embodiment of the present invention. It is the knitting | organization organization chart of the mesh sheet | seat of 1st Embodiment of this invention. It is a schematic diagram showing the knitted fabric structure of the warp knitting yarn of the mesh sheet | seat of 2nd Embodiment of this invention. It is a whole front view showing the mesh sheet of 2nd Embodiment of this invention. It is the knitting | organization organization chart of the mesh sheet of 2nd Embodiment of this invention.

  The mode for carrying out the present invention will be described in more detail with reference to the drawings specifically shown as follows.

“First Embodiment”
A first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a sheet body, and what is indicated by reference numeral 2 is a stitch row composed of two adjacent knitting yarns 2a and 2b.

  Moreover, what is indicated by reference numeral 3 is a reinforcing fiber thread, and what is indicated by reference numeral 4 is a weft insertion thread. Furthermore, what is indicated by reference numeral 5 is a through hole, and what is indicated by reference numeral 6 is a set stitch row in which the stitch rows 2 are gathered.

  Thus, in configuring the mesh sheet of the present invention, first, the stitch row 2 formed by the two adjacent knitting yarns 2a and 2b is formed close together by the knitting structure. For this knitting, for example, an 18 gauge Russell knitting machine made by KARL MAYER can be used.

  Next, in the aggregate stitch row 6, the reinforcing fiber yarns 3 made of reinforcing fibers are inserted through and the weft insertion yarns 4 are inserted at predetermined intervals to constitute the sheet body 1 of the knitted structure.

  In the present embodiment, the warp knitting structure of the knitting yarns 2a and 2b constituting the aggregate stitch row 6 can be a double denby structure guided by 1 in 1 out (alternately one).

  FIG. 1 is a schematic diagram illustrating a knitted fabric structure of a sheet body 1 of a high-strength warp knitted mesh sheet according to the present embodiment. The knitting yarn 2a and the knitting yarn 2b, which are warps, are respectively inserted into separate warp guides in 1in1out, and the knitting yarn 2a and the knitting yarn 2b are integrated by a denby structure (1/1 tricot knitting) opposite to each other. Thus, a set stitch row 6 is configured.

  In this embodiment, the reinforcing fiber yarns 3 are inserted into each set stitch row 6 after one stitch, and at least four stitches of weft insertion yarn 4 are inserted at predetermined intervals.

  In FIG. 1, two weft insertion yarns 4 are shown. Actually, at least 4 weft insertion yarns 4 are arranged in 1 in 1 out so that a folded portion exists in each set stitch row 6. Repeatedly swinging the needle.

  In FIG. 1, the weft insertion thread 4 is shown to be folded back for each course. However, when the course density is high, the distance in the course direction of the weft insertion thread 4 is reduced, and a through hole having a required size is obtained. In practice, it is preferable to turn back every 2 or 3 courses.

  In this embodiment, the number of laterally swinging needles of the weft insertion yarn 4 is related to the number of overlapping weft insertion yarns 4 connecting the set stitch rows 6 and 6, which is half the number of laterally swinging needles. However, when the horizontal swing is 4 stitches or less, the number of weft insertion yarns 4 connecting the aggregate stitch rows 6 and 6 is reduced to 2 or less, so that a large fineness is required to bear the strength in the width direction of the sheet. The weft insertion thread 4 is required.

  However, if the weft insertion thread 4 is thick, there is a problem that it is difficult to knit because of high rigidity. Therefore, it is better to increase the number of yarns with four fine stitches and to increase the number of thin yarns, ensuring sufficient width direction strength. It is possible to improve the knitting property, and at the same time, the stitch row is not distorted, which is preferable in terms of quality.

  Then, a through hole 5 is formed in a region surrounded by the set stitch rows 6 and 6 and the weft insertion yarns 4 and 4 adjacent to each other at a predetermined interval.

In the present embodiment, it is preferable that the shape of the through-hole 5 is substantially rectangular and the unit area per one is 0.1 to 3000 mm ² (more preferably 1 to 100 mm ² ). This is because it is too small at 0.1 mm ² or less and it takes a long time to drain rainwater contained in the soil. On the other hand, it is too large at 3000 mm ² or more, and soil and sand will be discharged at the same time as rainwater. .

The interval between the aggregate stitch rows 6 and 6 is determined by the needle interval of the knitting machine and the fineness of the knitting yarn 2a, the knitting yarn 2b and the reinforcing fiber yarn 3, and the interval between the weft insertion yarns 4 and 4 is determined by the coarse density. What is necessary is just to adjust suitably so that it may be 0.1-3000 mm < ² > which is a preferable size of the through-hole 5, depending on how the weft insertion yarn 4 is folded in the stitch row.

  Then, the reinforcing fiber yarn 3 is distributed to the yarn bundles 3a and 3b, respectively, and either one of the knitting yarns 2a and 2b constituting the stitch row 2 is interposed between the yarn bundles 3a and 3b in a tension state. To do.

  At this time, the warp-inserted reinforcing fiber yarns 3 are alternately inserted from the left and right of the set stitch row 6 so that they are once wavyly zigzag immediately after knitting. Since a material having a fineness several times thicker than 2b is used, the rigidity of the reinforcing fiber yarn 3 is superior to that of the knitting yarn, and the elastic fiber yarn 3 tends to be restored to a substantially linear shape by elasticity.

  By skillfully utilizing such elastic restoring action due to the rigidity of the reinforcing fibers, one of the knitting yarns 2a and 2b constituting the stitch row 2 interposed between the yarn bundles 3a and 3b (knitting yarn in the drawing). 2a) will be pulled and tense.

  In this way, when the knitting yarn 2a between the yarn bundles 3a and 3b of the reinforcing fiber yarn 3 is tensioned, the knitting yarn 2b is pressed to press the knitting yarn 2b, so that the knitting yarn 2b is also tensioned. Since it is wound around the bundles 3a and 3b and wrapped around the outer peripheral surface, the bundle 3a and 3b of the reinforcing fiber yarn 3 and the weft insertion yarn 4 can be tightened, so that an external force acts on the seat body 1. Even so, the reinforcing fiber yarn 3 does not come off easily.

  Further, since the two stitch rows forming the collective stitch row 6 are attracted to each other through the reinforcing fiber yarns 3, the gaps are formed between the collective stitch rows 6 and 6, and the reinforcing fiber yarns 3 are particularly thick. Even with a fine yarn, a sufficient gap can be provided with certainty.

  Further, in the present embodiment, if necessary, a high-strength weft insertion thread 4 that can be folded back only at both ends over the entire width of the knitting width of the sheet body 1 can be additionally inserted to obtain a sheet that does not easily stretch in the weft direction. Can do.

  When the mesh sheet of the present invention is used as a mat for placing a concrete block on a construction site, it is not damaged when it is laid by lifting it with a crane by grasping both ends in the length direction of the mat to which the concrete block is attached. Usually, the tensile strength in the length direction of the sheet is set to 50 kN / m or more. In addition, in the repair and reinforcement of concrete viaduct bridge piers and floor slabs, even higher tensile strength is required, and in particular for floor slabs, high tensile elastic modulus is required in order to minimize the bending of large automobiles and other loads. Therefore, the reinforcing fiber yarn 3 and the weft insertion yarn 4 (particularly the reinforcing fiber yarn 3 which is a warp yarn) are made of polyester fiber, polyamide fiber, polyolefin fiber, vinylon fiber, aramid fiber, carbon fiber which are high strength and high elastic modulus fibers. It is preferable to produce one or a plurality of glass fibers selected from glass fibers, and polyester fibers are particularly preferable in view of cost and knitting properties.

  In addition, the product of the fineness D (dtex) and the arrangement density W (lines / inch) of the warp-inserted reinforcing fiber yarn 3 is in the range of 1000 to 150,000 from the viewpoint of securing a tensile strength of the sheet of 50 kN / m or more. More preferably, it is 3000-100000, More preferably, it is the range of 10,000-75000. When the product of the fineness D (dtex) and the arrangement density W (lines / inch) of the reinforcing fiber yarn 3 inserted by warp is 1000 or less, the sheet cannot bear the weight when suspended with the concrete block attached. There is a problem that only a lightweight concrete block can be dealt with, and on the other hand, the product of the fineness D (dtex) and the arrangement density W (lines / inch) of the warped insertion reinforcing fiber yarn 3 is more than 150,000. This is because it has strength and wastes material costs, and the distance between the aggregate stitch rows 6 and 6 becomes close and the through holes 5 become too small.

  In this way, the mesh sheet of the present embodiment as shown in FIG. 2 is completed. Further, the knitting structure diagram of the mesh sheet of the present embodiment is as shown in FIG. 3, L1 is an ear thread for preventing fraying at the sheet end, L2 and L3 are knitting yarns 2a and 2b, L4 is a reinforcing fiber yarn 3, L5 indicates the weft insertion thread 4.

“Second Embodiment”
Next, a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the warp knitting structure of the knitting yarns 2a and 2b constituting the aggregate stitch row 6 is changed to a double denby change structure guided by 1 in 1 out, and the knitting yarn 2a constituting one aggregate stitch row 6 is provided. Tracer yarn formed by knitting with the knitting yarn 2b adjacent on the opposite side for each predetermined number of courses to form another set stitch row 6 and the boundary line between both set stitch rows and every predetermined number of wales A grid-like trace line is formed by (unusual colored yarn).

  FIG. 4 shows only the knitted fabric with the knitting yarns 2a and 2b in the mesh sheet of the present embodiment. In the group stitch row A, the knitting yarns 2a and 2b are integrated in a denby structure opposite to each other and the eight courses are integrated, and then in the group stitch row B, the knitting yarns 2a and 2b are respectively located on the opposite sides. The yarns 2a and 2b are integrated.

  At this time, the width at which the boundary between the set stitch rows A and B can be visually recognized by switching the set stitch rows by the knitting yarns 2a and 2b to the knitting yarns 2a and 2b positioned on the opposite side for each predetermined number of courses. Directional lines can be formed (see FIG. 5).

  Although not shown in the drawing, warp direction marks are formed by inserting warp yarns different from knitting yarns 2a and 2b and warp insertion reinforcing fiber yarns 3 together with the reinforcing fiber yarns 3 for every predetermined number of wales. Then, it is possible to form a grid-like trace line that matches the position where the concrete blocks are bonded together by the boundary line (the mark in the weft direction) between the aggregate stitch rows A and B. This trace line can also be obtained by setting one of the knitting yarns 2a and 2b to a different color tracer yarn for each predetermined number of wales.

  By doing so, it is possible to attach the concrete block efficiently, and at the same time, it is possible to attach the concrete block accurately, and it is possible to accurately cut the sheet in line with the line.

  In this way, the mesh sheet of this embodiment as shown in FIG. 5 is completed. The knitting structure diagram of the mesh sheet of the present embodiment is as shown in FIG. 6, L1 is an ear yarn for preventing fraying at the sheet end, L2 and L3 are knitting yarns 2a and 2b, L4 is a reinforcing fiber yarn 3, and L5 is A weft insertion thread 4 is shown.

  The present invention is generally configured as described above. However, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the description of “Claims”. The number and material of the thread 3 and the weft insertion thread 4 can be changed as appropriate.

  Moreover, although the sheet | seat of this invention was demonstrated using for a concrete block mat, it is not limited for this use, It can utilize suitably also as a sheet | seat used over civil engineering and construction relations in general.

  For example, the reinforcing fiber yarn of the sheet of the present invention is made of carbon fiber or aramid fiber having high strength and high modulus, which makes it suitable as a base material for repair and reinforcement of existing concrete viaduct bridge piers and floor slabs, especially concrete When the sheet of the present invention is bonded onto the surface of the high-viscosity resin applied to the surface and pressed with an impregnation roller, excess resin on the bottom surface overflows from the through-holes provided on the sheet, and the overflowed resin is in the sheet. Since it is impregnated from the surface, the impregnation work is performed very efficiently, and there is no resin accumulation phenomenon between the concrete surface and the sheet, and no unimpregnated part is formed, and a high reinforcing effect is exhibited. Can do.

DESCRIPTION OF SYMBOLS 1 Sheet | seat body 2 Stitch row 2a, 2b Knitting yarn 3 Reinforcing fiber yarn 3a, 3b Yarn bundle 4 Weft insertion yarn 5 Through hole 6 Collective stitch row

Claims (7)

While the stitch row (2) by two adjacent knitting yarns (2a, 2b) is close to each other by the knitting structure, the aggregate stitch row (6) is formed,
The warp knitting structure of the knitting yarns (2a, 2b) constituting the aggregate stitch row (6) is a double denby changing structure guided by 1 in 1 out,
The knitting yarn (2a) constituting one set stitch row (6) is knitted with the adjacent knitting yarn (2b) on the opposite side for each predetermined number of courses to form another set stitch row (6), A boundary line with both sets of stitch rows is formed,
In this set stitch row (6), the reinforcing fiber yarns (3) made of reinforcing fibers are inserted into the set stitch rows (6) by one stitch , and between the set stitch rows (6, 6). The weft insertion thread (4) to be connected is inserted at a predetermined interval to form a knitted fabric sheet body (1),
While a through hole (5) is formed in a region surrounded by the set stitch row (6, 6) and the weft insertion yarn (4, 4) adjacent to each other at a predetermined interval,
The reinforcing fiber yarn (3) is distributed to each of the yarn bundles (3a, 3b), and any one of the knitting yarns (2a, 2b) constituting the stitch row 2 between the yarn bundles (3a, 3b). One is interposed in a tension state, and the yarn bundle (3a, 3b) of the reinforcing fiber yarn (3) and the weft insertion yarn (4) are tightened by these knitting yarns (2a, 2b). High strength warp knitted mesh sheet.   The reinforcing fiber yarn (3) is inserted through a single stitch, and at least four stitches of weft insertion yarn (4) are inserted at predetermined intervals to form a knitted fabric sheet body (1). The high-strength warp knitted mesh sheet according to claim 1. The warp knitting structure of the knitting yarns (2a, 2b) constituting the aggregate stitch row (6) is a double denby changing structure guided by 1 in 1 out,
The knitting yarn (2a) constituting one set stitch row (6) is knitted with the adjacent knitting yarn (2b) on the opposite side for each predetermined number of courses to form another set stitch row (6), the boundary line between the two sets stitch row, the tracer yarn is inserted every predetermined number of wales, high strength warp knitting mesh sheet according to claim 1, wherein the forming the lattice-shaped trace lines. The high-strength warp knitted mesh sheet according to claim 1 or 2, further comprising a weft insertion thread (4) that is folded back only at both ends over the entire width of the knitting width of the sheet body (1). The reinforcing fiber yarn (3) and the weft insertion yarn (4) are made of one or more kinds of reinforcing fibers selected from polyester fiber, polyamide fiber, polyolefin fiber, vinylon fiber, aramid fiber, carbon fiber and glass fiber. The high-strength warp knitted mesh sheet according to any one of claims 1 to 4 , wherein the high-strength knitted mesh sheet is formed. The product of the fineness D (dtex) of the reinforcing fiber yarn and the arrangement density W (lines / inch) of the reinforcing fiber yarn (3) is in the range of 1000 to 150,000, according to any one of claims 1 to 5. High-strength warp knitted mesh sheet as described in 1. Holes (5) the shape of a substantially rectangular, and, according to any one of claims 1 to 6, wherein the unit area of the hole (5) is 0.1～3000Mm ² High-strength warp knitted mesh sheet.